<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
    <style media="screen">
    .box {
      width:300px; height:300px; background:#CCC; margin:10px auto 0;
      background-image:-webkit-linear-gradient(red, green);
    }
    </style>
  </head>
  <body>
    <div class="box"></div>
  </body>
</html>
